The group serenaded the Haddad's manager after he gave them extra food for free. Photo / Supplied
"They were sitting together enjoying their dinner and having a laugh among each other.
"We made their order and gave them extra food. They all came to say thanks and started teaching me some words in their language [Tongan]. They then told me 'brother, we want to sing for you.
"They sang their beautiful song and all the customers were blown away, clapping them.